Frequency doubling laser generating device

A generation device and frequency doubling technology, which is applied to lasers, laser components, phonon exciters, etc., can solve the problems of destroying the narrow linewidth characteristics of lasers, and the inability to obtain high-power single-frequency or narrow-linewidth frequency-doubling lasers, etc.

Active Publication Date: 2021-05-18
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, in the process of phase modulation, the linewidth of the single-frequency or narrow-linewidth laser needs to be broadened before amplification, which destroys the narrow linewidth characteristics of the laser to a certain extent, and the laser linewidth will be further widened after frequency doubling. Obtain high-power single-frequency or narrow-linewidth frequency-doubled lasers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The single-frequency laser 1 is a single-frequency distributed feedback (DFB) fiber laser with a linewidth of less than 100MHz, and the central wavelength is 1064nm; the phase modulator 2 adopts an electro-optic phase modulator with a fiber tail, and the signal generator 3 adopts an arbitrary wave signal source. Wave signal, frequency 100MHz, output amplitude 6V; laser amplifier 4 is a rare earth-doped fiber laser amplifier, and its gain fiber is an ytterbium-doped fiber, which is connected in turn by a primary isolator 4.1, a primary ytterbium-doped fiber amplifier 4.2, and a secondary Isolator 4.3, two-stage ytterbium-doped fiber amplifier 4.4, ..., (N+1) / 2-stage isolator 4.N, (N+1) / 2-stage ytterbium-doped fiber amplifier 4.N+1, N is Odd number; frequency doubling device 6 is a single-pass frequency doubling device, composed of optical lens 6.1, periodically polarized stoichiometric ratio lithium tantalate (PPSLT) frequency doubling crystal 6.2 and optical lens and bea...

Embodiment 2

[0037] Single-frequency laser 1 is a single-frequency external-cavity semiconductor (ECDL) laser with a linewidth of less than 120 MHz, with a central wavelength of 1178 nm, which can be loaded with an external radio frequency signal; phase modulator 2 is an electro-optic phase modulator with a fiber tail; signal generator 3 adopts any A wave signal source generates a square wave signal with a frequency of 1.71GHz and an output amplitude of 10V; the laser amplifier 4 is a fiber Raman laser amplifier, and its gain fiber is a phosphorous fiber, including an isolator and a phosphorous fiber amplifier of the phosphorous fiber amplifier; a frequency doubling device 6 is a resonant frequency doubling device, including a cavity mirror and a digital cavity-locked servo system. A 25MHz radio frequency signal is loaded on a single-frequency laser, and a triangular wave is output. After being amplified by a high-voltage amplifier module, the piezoelectric ceramic PZT is controlled. The tri...

Embodiment 3

[0039] The single-frequency laser 1 is a distributed Bragg reflection (DBR) single-frequency fiber laser with a linewidth of less than 10MHz, and the center wavelength is 1018nm; the phase modulator 2 is a space electro-optical phase modulator; the signal generator 3 is a pseudo-random code signal source, which generates 2 7-1 pseudo-random signal, pseudo-code rate 2Gbps, output amplitude 8V; laser amplifier 4 is a rare-earth doped solid-state laser amplifier, and its gain is ytterbium-doped yttrium aluminum garnet (Yb:YAG) crystal, which is connected in turn by a Stage isolator 4.1, stage one Yb:YAG amplifier 4.2, stage two isolator 4.3, stage two Yb:YAG amplifier 4.4, stage three isolator 4.5, stage three Yb:YAG amplifier 4.6; frequency multiplier 6 is single-pass frequency multiplication The device is composed of an optical lens, a beam splitter 6.1, and a frequency doubling crystal lithium triborate crystal (LBO) 6.2.

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Abstract

A frequency-doubled laser generating device comprises a single-frequency laser, a phase modulator, a laser amplifier, a spatial isolator and a frequency doubling device which are connected in sequence, and further comprises a signal generator which generates radio frequency or pseudo-random signals and is used for driving the phase modulator and modulating single-frequency laser with the output phase amplitude being Npi, after being amplified by the laser amplifier, the single-frequency laser is emitted into the frequency doubling device through the spatial isolator, single-frequency or narrow-linewidth frequency doubling light with the laser phase modulation amplitude of 2Npi is obtained, and N is an odd number. The phase modulator can realize phase modulation in a wider wavelength range, and meanwhile, high-power low-frequency fundamental frequency light obtained by the laser amplifier is subjected to frequency doubling to obtain single-frequency or narrow-linewidth frequency doubling light, so that the structure has the advantages of being simple, flexible in design and the like; a new technical scheme is provided for high-power and high-stability single-frequency or narrow-linewidth laser frequency doubling, and high practical value and application prospects are achieved.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a frequency-doubled laser generating device for phase-modulated fundamental frequency light, which is used for generating frequency-doubled laser with high spectral intensity. Background technique [0002] Visible and ultraviolet lasers have important applications in the fields of display, quantum information technology, laser remote sensing, astronomy and geophysics, biomedical imaging and therapy, industrial processing, and cold atoms. Infrared laser frequency doubling is the most common method. Laser extracavity frequency doubling technologies mainly include single-pass frequency doubling and resonance frequency doubling, which are effective ways to obtain high-power visible light and ultraviolet lasers. In laser frequency doubling, to achieve high nonlinear conversion efficiency, the fundamental frequency light is required to be a single-frequency or narrow-linewidth ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/08H01S3/10H01S3/109
CPCH01S3/109H01S3/06708H01S3/06754H01S3/08018H01S3/10053
Inventor 冯衍曾鑫崔淑珍
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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